thrift: fix m68k uclinux compile

The GCC manual suggest when getting:
relocation truncated to fit: R_68K_GOT16O foobar
to use -mxgot.

The failures happens after gnuplot compiles.

Fixes:
  http://autobuild.buildroot.net/results/d1e030c42f43f49575f36ecc82e9dd9018ca4f73/

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/thrift/thrift.mk

@@ -25,6 +25,11 @@ THRIFT_AUTORECONF_OPTS = -I $(HOST_DIR)/usr/share/autoconf-archive
 THRIFT_LICENSE = Apache-2.0
 THRIFT_LICENSE_FILES = LICENSE
 
+# relocation truncated to fit: R_68K_GOT16O
+ifeq ($(BR2_m68k_cf),y)
+THRIFT_CONF_ENV += CXXFLAGS="$(TARGET_CXXFLAGS) -mxgot"
+endif
+
 ifeq ($(BR2_STATIC_LIBS),y)
 # openssl uses zlib, so we need to explicitly link with it when static
 THRIFT_CONF_ENV += LIBS=-lz